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Related Concept Videos

Olfaction01:25

Olfaction

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The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...
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Physiology of Smell and Olfactory Pathway01:20

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Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
The olfactory...
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The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
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Functional Brain Systems: Limbic System01:15

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The limbic system, often called the "emotional brain," is a complex set of structures located deep within the brain. The intricate network of the limbic system supports a wide range of psychological functions, from emotional regulation to memory formation and sensory processing. This functional brain region encompasses specific parts of the diencephalon and the cerebrum, integrating the higher mental functions of the cerebral cortex with the primitive emotional responses of the deep brain...
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Diencephalon: Hypothalamus and Coordination01:23

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The hypothalamus is a small yet highly complex and essential brain region that plays a crucial role in regulating various bodily functions. Anatomically, it is located at the base of the brain, just above the brainstem and below the thalamus, forming part of the limbic system.
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Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
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Related Experiment Video

Updated: Oct 4, 2025

The Olfactory System as a Model to Study Axonal Growth Patterns and Morphology In Vivo
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The Olfactory System as a Model to Study Axonal Growth Patterns and Morphology In Vivo

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Connectivity and dynamics in the olfactory bulb.

David E Chen Kersen1,2,3, Gaia Tavoni1,4,5, Vijay Balasubramanian1,2,4,6

  • 1Computational Neuroscience Initiative, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America.

Plos Computational Biology
|February 7, 2022
PubMed
Summary
This summary is machine-generated.

We developed a large-scale computational model of the olfactory bulb network, integrating anatomical and physiological data to simulate odor processing. This model accurately reproduces known network behaviors and predicts new structure-function relationships.

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Area of Science:

  • Neuroscience
  • Computational Biology
  • Olfactory System Research

Background:

  • The olfactory bulb (OB) features complex dendrodendritic interactions between mitral and granule cells, crucial for odor perception.
  • Understanding how OB network architecture shapes collective behavior requires sophisticated computational models.

Purpose of the Study:

  • To create an efficient, anatomically and physiologically realistic large-scale computational model of the OB network.
  • To investigate the relationship between OB network structure and its functional properties, including odor processing and oscillations.

Main Methods:

  • Summarizing anatomical information via dendritic geometry and density to compute mitral-granule cell connection probabilities.
  • Utilizing Izhikevich's neural dynamical systems theory to capture cell activity patterns.
  • Developing a large-scale model integrating these anatomical and physiological parameters.

Main Results:

  • The model successfully reproduced known connectivity patterns, lateral inhibition, and theta, beta, and gamma oscillations.
  • It predicted testable relationships between network structure and lateral inhibition, odor decorrelation, and LFP oscillation frequency.
  • Explored cortical influence on OB activity and the role of neurogenesis in odor decorrelation.

Conclusions:

  • The developed model offers a tractable tool for studying OB network dynamics and function.
  • It provides insights into how OB network structure influences sensory representations and perception.
  • Demonstrated potential mechanisms for cortical feedback and neurogenesis effects on OB function.